Yeah, i think that's a pretty good technique, same as on domination.
4 people:
2 go for b, 2 camp back, the 2 that camp back sit and watch out for flankers but also help push up for B, make sure 1 stay's back for flankers, obviously the objective is to hold down 2 and keep 1 for a spawn lock.
If spawns change follow out same routine and sit in new camping styled spots, when playing domination it's all about the defense techniques to hold down the flags, also watch some grenade spot videos incase a sudden change or mistake.
5 people: similar technique except 3 go to B, 2 camp back and in case of a problem at B, 4 push up and 1 stay back